The 181 hp D4 engine with Polestar turns into the D5 original specification of 220 hp. At least for a 2016. Maybe you get only 215 hp in a 2015. Numbers here are from the Swedish market.
Doing a Polestar upgrade will, perhaps, do a very tiny improvement in the economy corner. But it's not worth the cost. If you add Polestar, then it's for the increased performance. The economy thing is so minor that it's sole purpose is to tell your missus that you did the upgrade to save money...
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